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Article type: Research Article
Authors: Provatidis, Christopher G.a; * | Gamble, Michael A.b
Affiliations: [a] Laboratory of Structures {and} Dynamics, Mechanical Engineering Department, National Technical University of Athens, Zografou Campus, Athens, Greece | [b] Flight Sciences {and} GNC Lab, Boeing Research and Technology, The Boeing Company, Seattle, WA, USA
Correspondence: [*] Corresponding author: Christopher G. Provatidis, Laboratory of Structures {and} Dynamics, Mechanical Engineering Department, National Technical University of Athens, Zografou Campus, 9 Heroes of Polytechnion Ave, 157 80 Athens, Greece. Fax: +30 210 772 2347; E-mail: [email protected]
Abstract: This paper deals with the dynamic analysis for the calculation of the support forces in a rotating elastic rod when subjected to simple types of axial forces. For simplicity the model starts with a linear straight spring and a lumped mass and expands into a distributed system. The analysis shows a shift in the natural frequency of the support forces, due to rotation and additional axial oscillations, these are highly influenced by both the axial and the shear forces, which are induced by the centripetal and Coriolis forces, respectively. Based on this finding, the paper shows that it is not possible to take advantage of the inertial forces and create long-term inertial thrust, even if the rotation is synchronized with the shifted natural frequency. The discussion includes extensions into the electromagnetic realm by comparing the mechanical system with its electrical equivalent.
Keywords: Natural frequency, rotation, synchronization, structural response, electromagnetics
DOI: 10.3233/JAE-121616
Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 41, no. 3, pp. 313-333, 2013
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